Do you have sunshine today? I really hope that day fourteen is bringing us nice weather so that we can have fun with this activity. Tom thought of this one - to draw chalk fires on the walls, pavements, gardens outside and use water pistols to put them out. Seriously fun right?
If it's raining don't worry, you could do an indoor variation by drawing the fires on paper and then throwing beanbags or soft toys onto them to put them out. Use your brilliant imagination and I'm sure you can make anything work :)